const path = require('path')
const fs = require('fs')

//注意： ../ 会抵消前面的路径
const pathStr = path.join('/a', '/b/c', '../', './d', 'e')
console.log(pathStr);// \a\b\d\e


// fs.readFile(__dirname + '/files/1.txt')

fs.readFile(path.join(__dirname, '/files/1.txt'), 'utf8', function(err, dataStr){
    if(err){
        return consolr.log(err.message)
    }
    console.log(dataStr);
})